Timeline for Relations as Sets

6 events

when toggle format	what		by	license	comment
Jun 7, 2019 at 13:18	answer	added	saulspatz		timeline score: 0
Jun 7, 2019 at 5:22	history	edited	Andrés E. Caicedo		edited tags
Jun 7, 2019 at 1:19	answer	added	Arturo Magidin		timeline score: 6
Jun 7, 2019 at 1:12	comment	added	Arturo Magidin		This is a relation between any set that contains $1$, $2$, and $3$, and any set that contains $1$, $2$, and $9$. It tells you that the $1$ in the first set is related to the $1$ in the second; that the $2$ in the first set is related to the $4$ in the second, and that the $3$ in the first set is related to the $9$ in the second. But you don’t speak of relations in the abstract, you speak of relation from one set $X$ to one set $Y$ (just like you don’t generally speak of “functions” without saying what the domain and codomain are, at least by convention).
Jun 7, 2019 at 1:11	comment	added	saulspatz		What is your definition of a relation?
Jun 7, 2019 at 1:08	history	asked	Frasch	CC BY-SA 4.0